1131321012 has 24 divisors (see below), whose sum is σ = 2648085216. Its totient is φ = 375916128.

The previous prime is 1131320989. The next prime is 1131321017. The reversal of 1131321012 is 2101231311.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1131320982 and 1131321000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131321017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144898 + ... + 152505.

It is an arithmetic number, because the mean of its divisors is an integer number (110336884).

Almost surely, 2^1131321012 is an apocalyptic number.

1131321012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1131321012 is an abundant number, since it is smaller than the sum of its proper divisors (1516764204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131321012 is a wasteful number, since it uses less digits than its factorization.

1131321012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297727 (or 297725 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1131321012 is about 33635.1157571964. The cubic root of 1131321012 is about 1041.9861613271.

Adding to 1131321012 its reverse (2101231311), we get a palindrome (3232552323).

It can be divided in two parts, 113 and 1321012, that added together give a triangular number (1321125 = T₁₆₂₅).

The spelling of 1131321012 in words is "one billion, one hundred thirty-one million, three hundred twenty-one thousand, twelve".